— Is it better to be physically attractive or intelligent?

   —                      . 

— Do you prefer a portable or a clumsy 3D printer?

—                      .

Sometimes buyers only purchase some        , tangible or intangible.

You can have eggs      or hard-boiled.

Goods are carried by several        of transport--on road or rail, by sea or air.

You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

— May I suggest the sales start on or about October 1?

—                      .

Prices may change quickly if supply or demand         .

— I wonder whether I could accept this discount or not.

—                      

2002年新配方口服补液盐(ORS)溶液的张力是

在结束异地的旅行与当地的导游和司机告别的时候，领队在代表团队对导游和司机表示感谢的同时要当着全体游客的面将小费递给导游和司机。